CPC / CPA breakeven calculator
Work backward from what a customer is worth: enter your average customer value, your lead-to-customer rate, and your click-to-lead rate. The calculator returns your breakeven cost per acquisition and the maximum cost per click that still makes money.
Enter customer value and your lead→customer rate to see breakeven CPA.
CPA = customer value × lead→customer rate · CPC = CPA × click→lead rate
example inputs — replace with your own numbers
Use your own funnel numbers
This calculator is only as good as the three numbers you feed it, so pull them from your own records rather than estimating. Customer value should come from what a new customer actually pays you — either a single purchase or, if you can measure it reliably, the value of the relationship over the period you're willing to plan against. The two conversion rates should come from your CRM or analytics, counted over a window long enough to be stable.
Read the outputs as ceilings. Breakeven CPA is the point where acquisition costs exactly what a customer is worth — profitable buying happens below it, which is what the optional margin field shows. If your target margin makes the affordable CPC uncomfortably low, the fix is usually upstream: raise conversion rates, raise customer value, or qualify traffic harder, rather than hunting for cheaper clicks alone.
Revisit the math quarterly, and any time pricing, offer, or sales process changes. Rates drift as audiences, creative, and seasonality shift, and a breakeven built on last year's funnel can quietly justify spending you can no longer afford. Keeping these three inputs current is the cheapest control you have over paid media.